This study was conducted to investigate the effect of weaning age on growth performance, nutrient digestion and metabolism, and serological indicators, and to obtain an optimal weaning age in Hu lambs.Forty-eight newb...This study was conducted to investigate the effect of weaning age on growth performance, nutrient digestion and metabolism, and serological indicators, and to obtain an optimal weaning age in Hu lambs.Forty-eight newborn Hu lambs(birth weight, 2.53 ± 0.14 kg) were randomly divided into 4 groups. The lambs in control group(ER) suckled their dams. The lambs in other three experimental groups were weaned on milk replacer at 10.20, and 30 days of age(EW10, EW20, and EW30 groups),respectively. The results were as follows: 1) lambs in EW10 and EW30 groups had a lower(P < 0.05) ADG than those in ER group within 10 days post-weaning; the weaned lambs began to show a higher(P < 0.05) ADG than those in ER group after 20 days post-weaning. 2) EW10 and EW20 groups had a higher(P < 0.05) creep feed intake than EW30 and ER groups from 15 to 60 days of age. 3) The apparent digestibility of dry matter, organic matter, gross energy, nitrogen, ether extract and phosphorus, and the deposition of nitrogen and phosphorus did not differ(P > 0.05) among groups; however, the apparent digestibility and deposition of calcium in early weaned lambs were lower(P < 0.05) than those in ewe-reared lambs. 4)The albumin content in EW30 group was lower(P < 0.05) than that in ER group; the globulin content in EW30 group was higher(P < 0.05) than that in other groups; the content of serum insulin-like growth factor-1 in weaned lambs tended to increase compared with lambs in ER group. Finally, the growth rate of lambs decreased within 10 days post-weaning, but early weaning boosted creep feed intake, leading to better growth and health later in life. The Hu lambs can be weaned on milk replacer and creep feed at 10 days of age.展开更多
This study evaluated the effects of dietary energy levels on growth performance,carcass traits,meat quality,and serum biochemical of female Hu lambs.Seventy female Hu lambs(aged 4 months)were randomly allotted to 5 di...This study evaluated the effects of dietary energy levels on growth performance,carcass traits,meat quality,and serum biochemical of female Hu lambs.Seventy female Hu lambs(aged 4 months)were randomly allotted to 5 dietary treatments.Lambs were fed diets with 5 levels of metabolizable energy(ME):9.17(E1),9.59(E2),10.00(E3),10.41(E4),and 10.82 MJ/kg(E5).The lambs were adapted to the experimental diets for 10 d and the experiment period lasted for 60 d.Dry matter intake and feed conversion ratio linearly(P<0.001)increased and decreased(P<0.001),respectively,with increasing dietary ME levels.Average daily gain(ADG)linearly(P<0.001)increased with increasing dietary ME levels,with the highest final body weight(P=0.041)observed in E4 group.Moreover,dietary energy level was associated with linear increases in serum total protein(TP)(P<0.001),albumin(ALB)(P=0.017),glucose(GLU)(P=0.004),and low-density lipoprotein cholesterol(LDLC)(P=0.006)concentrations,and it was associated with a quadratic decrease in serum triglyceride(TG)concentration(P=0.002).Serum ammonia concentration,which was firstly decreased and then increased,was quadratically affected by dietary ME levels(P=0.013).Compared with E1 group,lambs in E4 group had higher(P<0.05)live weights,carcass weights,mesenteric fat ratio,non-carcass fat ratio,and larger loin muscle area,but lower(P<0.05)meat colour a*and b*values,and lesser(P<0.05)C17:0,C20:0,C18:1 n-9 t,C18:3 n-3,and n-3 polyunsaturated fatty acids(PUFA),but greater(P<0.05)C18:3 n-6 and n-6:n-3 ratios in longissimus dorsi(LD)muscle tissue,and lesser(P<0.05)C17:0,C18:3 n-3,C22:6 n-3,and n-3 PUFA in the biceps femoris(BF)muscle tissue.The results demonstrated that increasing dietary energy level improved the growth performance and affected carcass traits,serum biochemical indexes,and fatty acid profiles in different muscles of female Hu lambs.For 4-month-old female Hu lambs,the recommended fattening energy level is 10.41 MJ/kg.展开更多
【目的】比较不同日龄湖羊Ovis aries羔羊瘤胃上皮细菌多样性及菌群组成差异,为幼龄反刍动物早期断奶提供理论依据。【方法】选用10只出生体质量相近的初生湖羊羔羊,分别于日龄30 d (D30)和45 d (D45)各屠宰5只以获得瘤胃上皮组织,对其...【目的】比较不同日龄湖羊Ovis aries羔羊瘤胃上皮细菌多样性及菌群组成差异,为幼龄反刍动物早期断奶提供理论依据。【方法】选用10只出生体质量相近的初生湖羊羔羊,分别于日龄30 d (D30)和45 d (D45)各屠宰5只以获得瘤胃上皮组织,对其进行测序及微生物多样性分析。【结果】D45组羔羊瘤胃上皮细菌的操作分类单元(OTU)个数显著多于D30组羔羊(P<0.05),Chao1指数D45组有增加的趋势(P=0.07)。与D45组相比,D30组羔羊瘤胃细菌弯曲杆菌属Campylobacter和肠单胞菌Intestinimonas的相对丰度显著降低(P<0.05),拟杆菌属Bacteroides和小杆菌属Dialister的相对丰度有降低的趋势(P=0.083);而萨顿氏菌属Suttonella、脱硫弧菌属Desulfobulbus和单胞菌属Brachymonas的相对丰度显著增加(P<0.05),琥珀酸菌属Succiniclasticum有增加的趋势(P=0.083)。相关性分析发现:萨顿氏菌属与瘤胃挥发性脂肪酸含量呈正相关(P<0.05),拟杆菌属、琥珀酸菌属、瘤胃球菌属Ruminococcus和奇异菌属Atopobium与瘤胃乳头长度呈负相关(P<0.01),琥珀酸菌属与瘤胃乳头宽度呈正相关(P<0.01)。【结论】不同日龄羔羊的瘤胃上皮细菌定植存在差异,这些菌群参与瘤胃挥发性脂肪酸代谢及瘤胃乳头发育。图7表2参32。展开更多
基金supported by the Special Fund for Agro-scientific Research in the Public Interest(201303143)China Scholarship Council Fund(201403250010)
文摘This study was conducted to investigate the effect of weaning age on growth performance, nutrient digestion and metabolism, and serological indicators, and to obtain an optimal weaning age in Hu lambs.Forty-eight newborn Hu lambs(birth weight, 2.53 ± 0.14 kg) were randomly divided into 4 groups. The lambs in control group(ER) suckled their dams. The lambs in other three experimental groups were weaned on milk replacer at 10.20, and 30 days of age(EW10, EW20, and EW30 groups),respectively. The results were as follows: 1) lambs in EW10 and EW30 groups had a lower(P < 0.05) ADG than those in ER group within 10 days post-weaning; the weaned lambs began to show a higher(P < 0.05) ADG than those in ER group after 20 days post-weaning. 2) EW10 and EW20 groups had a higher(P < 0.05) creep feed intake than EW30 and ER groups from 15 to 60 days of age. 3) The apparent digestibility of dry matter, organic matter, gross energy, nitrogen, ether extract and phosphorus, and the deposition of nitrogen and phosphorus did not differ(P > 0.05) among groups; however, the apparent digestibility and deposition of calcium in early weaned lambs were lower(P < 0.05) than those in ewe-reared lambs. 4)The albumin content in EW30 group was lower(P < 0.05) than that in ER group; the globulin content in EW30 group was higher(P < 0.05) than that in other groups; the content of serum insulin-like growth factor-1 in weaned lambs tended to increase compared with lambs in ER group. Finally, the growth rate of lambs decreased within 10 days post-weaning, but early weaning boosted creep feed intake, leading to better growth and health later in life. The Hu lambs can be weaned on milk replacer and creep feed at 10 days of age.
基金supported by Natural Science Foundation of Hunan Province(2017JJ1020,2018JJ3340)Young Elite Scientists Sponsorship Program by CAST(YESS20160086)+1 种基金Hunan Province’s Strategic and Emerging Industrial Projects(2018GK4035)Hunan Province’s Changsha-Zhuzhou-Xiangtan National Independent Innovation Demonstration Zone projects(2017XK2058)
文摘This study evaluated the effects of dietary energy levels on growth performance,carcass traits,meat quality,and serum biochemical of female Hu lambs.Seventy female Hu lambs(aged 4 months)were randomly allotted to 5 dietary treatments.Lambs were fed diets with 5 levels of metabolizable energy(ME):9.17(E1),9.59(E2),10.00(E3),10.41(E4),and 10.82 MJ/kg(E5).The lambs were adapted to the experimental diets for 10 d and the experiment period lasted for 60 d.Dry matter intake and feed conversion ratio linearly(P<0.001)increased and decreased(P<0.001),respectively,with increasing dietary ME levels.Average daily gain(ADG)linearly(P<0.001)increased with increasing dietary ME levels,with the highest final body weight(P=0.041)observed in E4 group.Moreover,dietary energy level was associated with linear increases in serum total protein(TP)(P<0.001),albumin(ALB)(P=0.017),glucose(GLU)(P=0.004),and low-density lipoprotein cholesterol(LDLC)(P=0.006)concentrations,and it was associated with a quadratic decrease in serum triglyceride(TG)concentration(P=0.002).Serum ammonia concentration,which was firstly decreased and then increased,was quadratically affected by dietary ME levels(P=0.013).Compared with E1 group,lambs in E4 group had higher(P<0.05)live weights,carcass weights,mesenteric fat ratio,non-carcass fat ratio,and larger loin muscle area,but lower(P<0.05)meat colour a*and b*values,and lesser(P<0.05)C17:0,C20:0,C18:1 n-9 t,C18:3 n-3,and n-3 polyunsaturated fatty acids(PUFA),but greater(P<0.05)C18:3 n-6 and n-6:n-3 ratios in longissimus dorsi(LD)muscle tissue,and lesser(P<0.05)C17:0,C18:3 n-3,C22:6 n-3,and n-3 PUFA in the biceps femoris(BF)muscle tissue.The results demonstrated that increasing dietary energy level improved the growth performance and affected carcass traits,serum biochemical indexes,and fatty acid profiles in different muscles of female Hu lambs.For 4-month-old female Hu lambs,the recommended fattening energy level is 10.41 MJ/kg.
文摘【目的】比较不同日龄湖羊Ovis aries羔羊瘤胃上皮细菌多样性及菌群组成差异,为幼龄反刍动物早期断奶提供理论依据。【方法】选用10只出生体质量相近的初生湖羊羔羊,分别于日龄30 d (D30)和45 d (D45)各屠宰5只以获得瘤胃上皮组织,对其进行测序及微生物多样性分析。【结果】D45组羔羊瘤胃上皮细菌的操作分类单元(OTU)个数显著多于D30组羔羊(P<0.05),Chao1指数D45组有增加的趋势(P=0.07)。与D45组相比,D30组羔羊瘤胃细菌弯曲杆菌属Campylobacter和肠单胞菌Intestinimonas的相对丰度显著降低(P<0.05),拟杆菌属Bacteroides和小杆菌属Dialister的相对丰度有降低的趋势(P=0.083);而萨顿氏菌属Suttonella、脱硫弧菌属Desulfobulbus和单胞菌属Brachymonas的相对丰度显著增加(P<0.05),琥珀酸菌属Succiniclasticum有增加的趋势(P=0.083)。相关性分析发现:萨顿氏菌属与瘤胃挥发性脂肪酸含量呈正相关(P<0.05),拟杆菌属、琥珀酸菌属、瘤胃球菌属Ruminococcus和奇异菌属Atopobium与瘤胃乳头长度呈负相关(P<0.01),琥珀酸菌属与瘤胃乳头宽度呈正相关(P<0.01)。【结论】不同日龄羔羊的瘤胃上皮细菌定植存在差异,这些菌群参与瘤胃挥发性脂肪酸代谢及瘤胃乳头发育。图7表2参32。
